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练习二

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#1 Created at ... [Delete] [Delete and Lock User]

var welcome = arr.slice(); welcome .sort(); alert('欢迎'+welcome.slice(0,welcome.length-1)+'和'+welcome[welcome.length-1]+'同学!');

1：首先作为欢迎语不应该直接改动arr对象 2：var的长度是不定值。

渴望成全我和她

#2 Created at ... [Delete] [Delete and Lock User]

这样写具有更好的扩展性

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